int gets1(int var1, int var2)
{
	int i, j;
	int change1;
	i = 0;
	do
	{
		i = i + 1;
		var1 = var2 + var1;
	} while (i < var2);
	change1 = var1;
	return (change1);
}

void main()
{
	const int const1 = -21, const2 = 10;

	int k;
	scanf(k);
	if (k < const2)
	{
		printf(gets1(const1, k));
	}
	else
	{
		printf("Hello World");
	}
}